Importance

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Abstract

The present invention comprises a lighting unit having a light source emitting light, a reflector placed behind the light source for reflecting the emitted light, and a lens held in front of the light source. The lens is substantially flat and circular. The lens has a predetermined structure that comprises a light-emitting surface and a light-incident surface opposing the light-emitting surface. The light-incident surface of the lens is formed into a vertically oriented high-frequency waveform. In the first embodiment of the lens, the light-emitting surface is substantially flat and the high-frequency waveform is obtained from a combination of a first primary waveform and the third harmonic of the first primary waveform; that is, the high-frequency waveform is derived from the equation ##EQU1## The first embodiment of the lens spreads the emitted light with a graduated distribution horizontally about 20 degrees as measured from the edge of the lens. In the second embodiment of the lens, the light-emitting surface is formed into a vertically oriented low-frequency waveform derived from the equation ##EQU2## The light-incident surface is formed into a vertically oriented high-frequency waveform obtained from a combination of a second primary waveform and the third and fifth harmonics of the second primary waveform. That is, the high-frequency waveform of the second embodiment is derived from the equation ##EQU3## The second lens embodiment spreads the emitted light with a graduated distribution horizontally about 45 degrees as measured from the edge of the lens.

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First Claim